I’d advise against it, especially for younger children (I know the UK boarding schools can start unbelievably young). I went to boarding school and had an awful experience on multiple levels. I still haven’t fully recovered in terms of mental health and I graduated almost a decade ago.

I know two adults who went to different boarding schools and they have eerily similar social awkwardness. They both strongly believe they are “ahead of time” and it’s the inability of the world to accept their exceptional brilliance that keeps them from holding down a job. Also, both of them suffered sexual abuse from other students while they were there. Granted, that isn’t an enormous pool to survey, but it’s enough for me to discourage boarding schools.